Im running Lucid not Maverick.

My video card is a RV740 Pro [Radeon HD 4650].

When I moved from 9.04 to 10.04 I did a fresh install, and the video has worked
perfectly until now.

Im not running any desktop effects.

Im not using any proprietary drivers.. just did a fresh install of 10.04 and its
been working.

Someone suggested selecting the previous entry in the list, 2.6.32-24 when
booting, which I did, but had the same problems there.